﻿/*
 * Twipler - Twitter Web Client with features.
 *  
 *  Copyright (C) 2009, 2010. Ian Quigley
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details. 
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */


using System.Xml;
using System.Collections.Generic;

using Twipler.App.Machine;
using Twipler.App.Parse;
using Twipler.App.DataDoc;
using Twipler.App.Parse.Html.Consumers;

namespace Twipler.App.Render.Tree
{
    public class FieldItem : AbstractItem
    {
        private FieldConsumer.FieldConsumerParameters _arguments;

        public override List<AbstractItem> Children { get { return null; } }

        public static FieldItem Create(FieldConsumer.FieldConsumerParameters  arguments)
        {
            FieldItem fi = new FieldItem();
            fi._arguments = arguments;

            return fi;
        }

        public override void Render(System.Text.StringBuilder html, App.Machine.Environment environment)
        {
            object obj = null;

            if (_arguments.Source != null)
            {
                obj = _arguments.Source.Invoke(environment);
            }

            if (_arguments.Program != null)
                obj = environment.Execute(_arguments.Program);
           
            if ((_arguments.Name != null) && (_arguments.Field != null))
            {
                IDataDoc wrapper = environment.Variables_Get(_arguments.Name) as IDataDoc;
                if (wrapper != null)
                {
                    obj = wrapper.Find(_arguments.Field);
                    
                    if (obj != null)
                        obj = ((DataDocValue) obj).Value;
                }
            }

            if (obj != null)
                html.Append(obj.ToString());                   
        }

    }
}
